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6#include <linux/list.h>
7#include <linux/list_sort.h>
8#include <linux/llist.h>
9
10#include "i915_drv.h"
11#include "intel_engine.h"
12#include "intel_engine_user.h"
13#include "intel_gt.h"
14#include "uc/intel_guc_submission.h"
15
16struct intel_engine_cs *
17intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance)
18{
19 struct rb_node *p = i915->uabi_engines.rb_node;
20
21 while (p) {
22 struct intel_engine_cs *it =
23 rb_entry(p, typeof(*it), uabi_node);
24
25 if (class < it->uabi_class)
26 p = p->rb_left;
27 else if (class > it->uabi_class ||
28 instance > it->uabi_instance)
29 p = p->rb_right;
30 else if (instance < it->uabi_instance)
31 p = p->rb_left;
32 else
33 return it;
34 }
35
36 return NULL;
37}
38
39void intel_engine_add_user(struct intel_engine_cs *engine)
40{
41 llist_add((struct llist_node *)&engine->uabi_node,
42 (struct llist_head *)&engine->i915->uabi_engines);
43}
44
45static const u8 uabi_classes[] = {
46 [RENDER_CLASS] = I915_ENGINE_CLASS_RENDER,
47 [COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY,
48 [VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO,
49 [VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE,
50};
51
52static int engine_cmp(void *priv, const struct list_head *A,
53 const struct list_head *B)
54{
55 const struct intel_engine_cs *a =
56 container_of((struct rb_node *)A, typeof(*a), uabi_node);
57 const struct intel_engine_cs *b =
58 container_of((struct rb_node *)B, typeof(*b), uabi_node);
59
60 if (uabi_classes[a->class] < uabi_classes[b->class])
61 return -1;
62 if (uabi_classes[a->class] > uabi_classes[b->class])
63 return 1;
64
65 if (a->instance < b->instance)
66 return -1;
67 if (a->instance > b->instance)
68 return 1;
69
70 return 0;
71}
72
73static struct llist_node *get_engines(struct drm_i915_private *i915)
74{
75 return llist_del_all((struct llist_head *)&i915->uabi_engines);
76}
77
78static void sort_engines(struct drm_i915_private *i915,
79 struct list_head *engines)
80{
81 struct llist_node *pos, *next;
82
83 llist_for_each_safe(pos, next, get_engines(i915)) {
84 struct intel_engine_cs *engine =
85 container_of((struct rb_node *)pos, typeof(*engine),
86 uabi_node);
87 list_add((struct list_head *)&engine->uabi_node, engines);
88 }
89 list_sort(NULL, engines, engine_cmp);
90}
91
92static void set_scheduler_caps(struct drm_i915_private *i915)
93{
94 static const struct {
95 u8 engine;
96 u8 sched;
97 } map[] = {
98#define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }
99 MAP(HAS_PREEMPTION, PREEMPTION),
100 MAP(HAS_SEMAPHORES, SEMAPHORES),
101 MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
102#undef MAP
103 };
104 struct intel_engine_cs *engine;
105 u32 enabled, disabled;
106
107 enabled = 0;
108 disabled = 0;
109 for_each_uabi_engine(engine, i915) {
110 int i;
111
112 if (engine->sched_engine->schedule)
113 enabled |= (I915_SCHEDULER_CAP_ENABLED |
114 I915_SCHEDULER_CAP_PRIORITY);
115 else
116 disabled |= (I915_SCHEDULER_CAP_ENABLED |
117 I915_SCHEDULER_CAP_PRIORITY);
118
119 if (intel_uc_uses_guc_submission(&i915->gt.uc))
120 enabled |= I915_SCHEDULER_CAP_STATIC_PRIORITY_MAP;
121
122 for (i = 0; i < ARRAY_SIZE(map); i++) {
123 if (engine->flags & BIT(map[i].engine))
124 enabled |= BIT(map[i].sched);
125 else
126 disabled |= BIT(map[i].sched);
127 }
128 }
129
130 i915->caps.scheduler = enabled & ~disabled;
131 if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED))
132 i915->caps.scheduler = 0;
133}
134
135const char *intel_engine_class_repr(u8 class)
136{
137 static const char * const uabi_names[] = {
138 [RENDER_CLASS] = "rcs",
139 [COPY_ENGINE_CLASS] = "bcs",
140 [VIDEO_DECODE_CLASS] = "vcs",
141 [VIDEO_ENHANCEMENT_CLASS] = "vecs",
142 };
143
144 if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])
145 return "xxx";
146
147 return uabi_names[class];
148}
149
150struct legacy_ring {
151 struct intel_gt *gt;
152 u8 class;
153 u8 instance;
154};
155
156static int legacy_ring_idx(const struct legacy_ring *ring)
157{
158 static const struct {
159 u8 base, max;
160 } map[] = {
161 [RENDER_CLASS] = { RCS0, 1 },
162 [COPY_ENGINE_CLASS] = { BCS0, 1 },
163 [VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },
164 [VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },
165 };
166
167 if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))
168 return INVALID_ENGINE;
169
170 if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))
171 return INVALID_ENGINE;
172
173 return map[ring->class].base + ring->instance;
174}
175
176static void add_legacy_ring(struct legacy_ring *ring,
177 struct intel_engine_cs *engine)
178{
179 if (engine->gt != ring->gt || engine->class != ring->class) {
180 ring->gt = engine->gt;
181 ring->class = engine->class;
182 ring->instance = 0;
183 }
184
185 engine->legacy_idx = legacy_ring_idx(ring);
186 if (engine->legacy_idx != INVALID_ENGINE)
187 ring->instance++;
188}
189
190void intel_engines_driver_register(struct drm_i915_private *i915)
191{
192 struct legacy_ring ring = {};
193 u8 uabi_instances[4] = {};
194 struct list_head *it, *next;
195 struct rb_node **p, *prev;
196 LIST_HEAD(engines);
197
198 sort_engines(i915, &engines);
199
200 prev = NULL;
201 p = &i915->uabi_engines.rb_node;
202 list_for_each_safe(it, next, &engines) {
203 struct intel_engine_cs *engine =
204 container_of((struct rb_node *)it, typeof(*engine),
205 uabi_node);
206 char old[sizeof(engine->name)];
207
208 if (intel_gt_has_unrecoverable_error(engine->gt))
209 continue;
210
211 GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
212 engine->uabi_class = uabi_classes[engine->class];
213
214 GEM_BUG_ON(engine->uabi_class >= ARRAY_SIZE(uabi_instances));
215 engine->uabi_instance = uabi_instances[engine->uabi_class]++;
216
217
218 memcpy(old, engine->name, sizeof(engine->name));
219 scnprintf(engine->name, sizeof(engine->name), "%s%u",
220 intel_engine_class_repr(engine->class),
221 engine->uabi_instance);
222 DRM_DEBUG_DRIVER("renamed %s to %s\n", old, engine->name);
223
224 rb_link_node(&engine->uabi_node, prev, p);
225 rb_insert_color(&engine->uabi_node, &i915->uabi_engines);
226
227 GEM_BUG_ON(intel_engine_lookup_user(i915,
228 engine->uabi_class,
229 engine->uabi_instance) != engine);
230
231
232 add_legacy_ring(&ring, engine);
233
234 prev = &engine->uabi_node;
235 p = &prev->rb_right;
236 }
237
238 if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) &&
239 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
240 struct intel_engine_cs *engine;
241 unsigned int isolation;
242 int class, inst;
243 int errors = 0;
244
245 for (class = 0; class < ARRAY_SIZE(uabi_instances); class++) {
246 for (inst = 0; inst < uabi_instances[class]; inst++) {
247 engine = intel_engine_lookup_user(i915,
248 class, inst);
249 if (!engine) {
250 pr_err("UABI engine not found for { class:%d, instance:%d }\n",
251 class, inst);
252 errors++;
253 continue;
254 }
255
256 if (engine->uabi_class != class ||
257 engine->uabi_instance != inst) {
258 pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",
259 engine->name,
260 engine->uabi_class,
261 engine->uabi_instance,
262 class, inst);
263 errors++;
264 continue;
265 }
266 }
267 }
268
269
270
271
272
273 isolation = intel_engines_has_context_isolation(i915);
274 for_each_uabi_engine(engine, i915) {
275 unsigned int bit = BIT(engine->uabi_class);
276 unsigned int expected = engine->default_state ? bit : 0;
277
278 if ((isolation & bit) != expected) {
279 pr_err("mismatching default context state for class %d on engine %s\n",
280 engine->uabi_class, engine->name);
281 errors++;
282 }
283 }
284
285 if (drm_WARN(&i915->drm, errors,
286 "Invalid UABI engine mapping found"))
287 i915->uabi_engines = RB_ROOT;
288 }
289
290 set_scheduler_caps(i915);
291}
292
293unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)
294{
295 struct intel_engine_cs *engine;
296 unsigned int which;
297
298 which = 0;
299 for_each_uabi_engine(engine, i915)
300 if (engine->default_state)
301 which |= BIT(engine->uabi_class);
302
303 return which;
304}
305
